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>Chapter 10. Graph a Single SNMP OID</H1
><P
>			When dealing with SNMP-enabled devices, there are often times when you want to graph the value of a single
			OID. This tutorial explains how to do this in Cacti. It also assumes that you have the "SNMP - Generic OID
			Template" graph template, which is now included in Cacti as of version 0.8.5. If you do not see this
			template listed under <SPAN
CLASS="GUILABEL"
>Graph Templates</SPAN
>, download the template from the Cacti website
			in XML form and import it using the <SPAN
CLASS="GUILABEL"
>Import Templates</SPAN
> menu item.
		</P
><P
>			To start the process of creating a new graph for your OID, click the <SPAN
CLASS="GUILABEL"
>New Graphs</SPAN
> menu
			item and select the host that contains the target OID from the dropdown. Under the <SPAN
CLASS="GUILABEL"
>Graph
			Templates</SPAN
> box, you will see a dropdown on the last line that reads <SPAN
CLASS="GUILABEL"
>(Select a graph
			type to create)</SPAN
>. From this dropdown, choose "SNMP - Generic OID Template" and click the
			<SPAN
CLASS="GUILABEL"
>Create</SPAN
> button at the bottom of the page.
		</P
><P
>			You will be presented with several fields that will require input before the new graph can be created.
			They are described in more detail below.
		</P
><DIV
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NAME="AEN1178"
></A
><P
><B
>Table 10-1. Field Description: SNMP - Generic OID Template</B
></P
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><COL
WIDTH="1*"><COL
WIDTH="3*"><THEAD
><TR
><TH
ALIGN="CENTER"
>Name</TH
><TH
ALIGN="CENTER"
>Description</TH
></TR
></THEAD
><TBODY
><TR
><TD
>(Graph) Title</TD
><TD
>The title that is to be used for the new graph. It is generally a good idea to keep |host_description| in the title, as to make the graph easier to identify later.</TD
></TR
><TR
><TD
>(Graph) Vertical Label</TD
><TD
>The text that will be printed along the y-axis of the graph. It is generally used to describe units, such as 'bytes' or 'percent'.</TD
></TR
><TR
><TD
>(Graph Items) Legend Color</TD
><TD
>The color that will be used to represent the data on the graph.</TD
></TR
><TR
><TD
>(Graph Items) Opacity/Alpha Channel</TD
><TD
>This optionally provides an opacity (not available with rrdtool-1.0.x) for a colored item.</TD
></TR
><TR
><TD
>(Graph Items) Legend Text</TD
><TD
>The text that will be used to describe the data on the graph legend.</TD
></TR
><TR
><TD
>(Data Source) Name</TD
><TD
>The title that is to be used for the new data source. It is generally a good idea to keep |host_description| in the title, as to make the data source easier to identify later.</TD
></TR
><TR
><TD
>(Data Source) Maximum Value [snmp_oid]</TD
><TD
>The maximum value that will be accepted from the OID. Make sure you choose a value that is reasonable for the data you are trying to graph because anything larger than the maximum will be ignored. If you are graphing a percentage, you should use '100' as the value should never exceed this.</TD
></TR
><TR
><TD
>(Data Source) Data Source Type [snmp_oid]</TD
><TD
>How the data from the OID should be stored by RRDTool and interpreted on the graph. If the value of the OID represents the actual data, you should use <SPAN
CLASS="GUILABEL"
>GAUGE</SPAN
> for this field. If the OID value is a constantly incrementing number, you should use <SPAN
CLASS="GUILABEL"
>COUNTER</SPAN
> for this field. The two remaining field values, <SPAN
CLASS="GUILABEL"
>DERIVE</SPAN
> and <SPAN
CLASS="GUILABEL"
>ABSOLUTE</SPAN
> can be ignored in most situations.</TD
></TR
><TR
><TD
>(Custom Data) OID</TD
><TD
>The actual SNMP OID to graph. It is typically a good idea to enter the number OID here as opposed to using MIB names. For instance, to get the number of open files on a Netware server, you would use ".1.3.6.1.4.1.23.2.28.2.7.0" as the OID.</TD
></TR
></TBODY
></TABLE
></DIV
><P
>			When finished filling in values for these fields, click the <SPAN
CLASS="GUILABEL"
>Create</SPAN
> button. Your new graph can
			now be accessed through the <SPAN
CLASS="GUILABEL"
>Graph Management</SPAN
> page or the <SPAN
CLASS="GUILABEL"
>Graphs</SPAN
> tab
			inside of Cacti.
		</P
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